Toothbrush head insert



FIG. 1 is a perspective view of a toothbrush head insert showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is an elevational view of one side thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is an end elevational view thereof, the opposite end being a mirror image; and,

FIG. 6 is a side elevational view thereof, taken from the side opposite that shown in FIG. 3.

The broken line showing of brush bristles is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a toothbrush head insert, as shown and described. 